3 * helicoid (gernalized torus) demo
6 * This code provides a very simple example of the helicoid primitive.
7 * Most of this code is required to set up OpenGL and GLUT, and very
8 * very little to set up the helix drawer. Don't blink!
10 * =======> MOUSE HOOKED UP TO AFFINE < ========
13 * Written by Linas Vepstas, March 1995
16 /* required include files */
29 /* most recent mouse postion */
36 void InitStuff_helix4 (void)
40 /* draw the helix shape */
41 void DrawStuff_helix4 (void)
44 double delta_affine[2][3];
46 glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
47 glColor3f (0.7, 0.5, 0.3);
49 /* set up some matrices so that the object spins with the mouse */
51 glTranslatef (0.0, 0.0, -80.0);
52 glRotatef(rot_x, 1, 0, 0);
53 glRotatef(rot_y, 0, 1, 0);
54 glRotatef(rot_z, 0, 0, 1);
55 /* glRotatef (220.0, 0.0, 1.0, 0.0); */
56 /* glRotatef (65.0, 1.0, 0.0, 0.0); */
58 /* Phew. FINALLY, Draw the helix -- */
59 affine [0][0] = 1.0/ (0.01*lastx);
62 affine [1][1] = 0.01*lastx;
66 delta_affine [0][0] = 0.0;
67 delta_affine [1][0] = 0.03*lasty;
68 delta_affine [0][1] = -0.03*lasty;
69 delta_affine [1][1] = 0.0;
70 delta_affine [0][2] = 0.0;
71 delta_affine [1][2] = 0.0;
73 gleSetJoinStyle (TUBE_NORM_EDGE | TUBE_JN_ANGLE | TUBE_JN_CAP);
74 gleHelicoid (1.0, 7.0, -1.0,
75 -4.0, 6.0, affine, delta_affine, 0.0, 980.0);
80 /* ------------------------- end of file ----------------- */